YES

This TRS is terminating using the restricteddeltasimple interpretation 
len(delta7, X6) =  + 1*X6 + 0 + 1*X6*delta7 + 0*delta7
add(delta6, X5, X4) =  + 1*X4 + 1*X5 + 0 + 0*X4*delta6 + 1*X5*delta6 + 0*delta6
from(delta5, X3) =  + 1*X3 + 1 + 0*X3*delta5 + 1*delta5
s(delta4) =  + 1 + 0*delta4
cons(delta3, X2) =  + 1*X2 + 1 + 0*X2*delta3 + 0*delta3
0(delta2) =  + 1 + 0*delta2
fst(delta1, X1, X0) =  + 1*X0 + 1*X1 + 0 + 0*X0*delta1 + 1*X1*delta1 + 0*delta1
nil(delta0) =  + 1 + 0*delta0
len_tau_1(delta7) =  + (delta7/(1 + 1 * delta7))
add_tau_1(delta6) =  + (delta6/(1 + 1 * delta6))
add_tau_2(delta6) =  + (delta6/(1 + 0 * delta6))
from_tau_1(delta5) =  + (delta5/(1 + 0 * delta5))
cons_tau_1(delta3) =  + (delta3/(1 + 0 * delta3))
fst_tau_1(delta1) =  + (delta1/(1 + 1 * delta1))
fst_tau_2(delta1) =  + (delta1/(1 + 0 * delta1))

Time: 0.345710 seconds
SUCCESS

Statistics:
Number of monomials: 168